unified code verification service

frontend/pshared/lib/api/responses/verification/response.dart

@@ -0,0 +1,29 @@
+import 'package:json_annotation/json_annotation.dart';
+
+part 'response.g.dart';
+
+
+@JsonSerializable()
+class VerificationResponse {
+  @JsonKey(name: 'ttl_seconds', defaultValue: 0)
+  final int ttlSeconds;
+  @JsonKey(name: 'cooldown_seconds', defaultValue: 0)
+  final int cooldownSeconds;
+  @JsonKey(defaultValue: '')
+  final String destination;
+  final String idempotencyKey;
+
+  const VerificationResponse({
+    required this.ttlSeconds,
+    required this.cooldownSeconds,
+    required this.destination,
+    required this.idempotencyKey,
+  });
+
+  Duration get cooldownDuration => Duration(seconds: cooldownSeconds);
+  Duration get ttlDuration => Duration(seconds: ttlSeconds);
+
+  factory VerificationResponse.fromJson(Map<String, dynamic> json) => _$VerificationResponseFromJson(json);
+
+  Map<String, dynamic> toJson() => _$VerificationResponseToJson(this);
+}